Coil body, inductive rotational speed sensor, and method for producing the same

Patent metadata

Field	Value
Publication number	US-2022018870-A1
Application number	US-201917312356-A
Country	US
Kind code	A1
Filing date	Dec 3, 2019
Priority date	Dec 18, 2018
Publication date	Jan 20, 2022
Grant date	—

Abstract

A coil body for an inductive rotational speed sensor, including: a base body having at least one winding region for coil windings about an axial axis and an opening for receiving a pole assembly along the axial axis; and two current rails, each of which run parallel to the axial axis and include a contact region for electrical connection cables to connect the coil in the winding region to the electrical connection cables, in which each of the contact regions includes at least one bendable section to guide the electrical connection cables at least in some sections parallel to the axial axis or, perpendicular thereto, in a radial manner. Also described are a related inductive rotational speed sensor, and related methods.

First claim

1 - 14 . (canceled)

15 . A coil body for an inductive rotational speed sensor, comprising:
a base body having at least one winding region for coil windings about an axial axis and an opening for receiving a pole assembly along the axial axis; and two current rails, each of which run parallel to the axial axis and include a contact region for electrical connection cables to connect the coil in the winding region to the electrical connection cables; wherein each of the contact regions includes at least one bendable section to guide the electrical connection cables at least in some sections parallel to the axial axis or, perpendicular thereto, in a radial manner.

16 . The coil body of claim 15 , further comprising:
at least one anti-rotation device that is embodied as a radial protrusion on the base body by virtue of retaining the coil body in the encapsulation tool to prevent the coil body from rotating during an encapsulation process.

17 . The coil body of claim 15 , wherein the base body includes at least one latching hook that is embodied so as to fix a pole assembly that is inserted in the opening of the base body so as to prevent an axial movement of the inserted pole assembly.

18 . The coil body of claim 15 , wherein the base body includes at least one venting opening for connecting an inner region of the base body, which is accessible through the opening, to an outer region to equalize the pressure between the inner region of the base body and the outer region as the pole assembly is inserted.

19 . The coil body of claim 15 , wherein the two current rails each include a compressible slit in which at least one wire of the coil is insertable, wherein the slit is embodied so as to reduce a slit width as it is compressed, and wherein opposite stops prevent the inserted wire from being cut through.

20 . The coil body of claim 15 , wherein each of the two current rails include: a tab fixed to the base body to prevent an axial displacement relative to the base body; and/or a barrier that is embodied to divert, during an encapsulation procedure, an encapsulating mass in the encapsulation tool to protect an electrical contact to the coil.

21 . The coil body of claim 15 , wherein the contact regions each include a surface area for welding or soldering or crimping the electrical connection cable, or a further contacting arrangement to fasten the electrical connection cables to respective ones of the contact regions.

22 . An inductive rotational speed sensor, comprising:
a coil body for an inductive rotational speed sensor, including:
a base body having at least one winding region for coil windings about an axial axis and an opening for receiving a pole assembly along the axial axis; and
two current rails, each of which run parallel to the axial axis and include a contact region for electrical connection cables to connect the coil in the winding region to the electrical connection cables;
wherein each of the contact regions includes at least one bendable section to guide the electrical connection cables at least in some sections parallel to the axial axis or, perpendicular thereto, in a radial manner;
a coil winding in the winding region of the base body; a pole assembly having a magnet and a pole core in the opening of the base body; and a casing made from a synthetic material, from an encapsulating mass that encases the coil body having the coil winding and the pole assembly at least in part.

23 . The inductive rotational speed sensor of claim 22 , wherein the anti-rotation device protrudes in part out of the casing or extends at least as far as an outer surface of the casing.

24 . The inductive rotational speed sensor of claim 22 , wherein the casing includes ribs having a plateau on which the ribs end, further comprising:
a protective sleeve that is embodied at least in part around the casing and is joined to the casing by a caulking site by using the plateau.

25 . The inductive rotational speed sensor of claim 22 , further comprising:
electrical connection cables connected to the contact regions and running at least in part parallel to the axial axis to form an axial rotational speed sensor or run perpendicular thereto to form a radial rotational speed sensor.

26 . A method for producing a current rail for a coil body, the method comprising:
stamping a flat metal sheet to form a contact region, a connection region for the coil windings and an intermediate region between the contact region and the connection region, wherein the coil body includes:
a base body having at least one winding region for coil windings about an axial axis and an opening for receiving a pole assembly along the axial axis; and
two current rails, each of which run parallel to the axial axis and include a contact region for electrical connection cables to connect the coil in the winding region to the electrical connection cables;
wherein each of the contact regions includes at least one bendable section to guide the electrical connection cables at least in some sections parallel to the axial axis or, perpendicular thereto, in a radial manner;
cutting a slit for at least one coil wire; bending the connection region to form a U-shaped end section having the slit in a protruding limb; bending the contact region about a longitudinal direction; and bending, if the current rail is used for a radial inductive sensor, an end section of the contact region again about an axis that is perpendicular to the flat metal sheet.

27 . A method for producing a coil body for an inductive rotational speed sensor, the method comprising:
providing a base body that includes a winding region for coil windings about an axial axis and an opening for receiving a pole assembly along the axial axis; and attaching two current rails that each run parallel to the axial axis and comprise a contact region for electrical connection cables to connect the coil in the winding region to the electrical connection cables,

28 . The method of claim 27 , further comprising:
bending the contact regions perpendicular to the axial axis to guide the electrical connection cables at least in some sections perpendicular to the axial axis.

Assignees

• Knorr Bremse Systeme Fuer Nutzfahrzeuge Gmbh

Inventors

• Lechner Klaus
• Kluftinger Andre
• Huber Christoph
• Palzer Stefan
• Buettner Martin
• Fruhstorfer Ines

Classifications

• H01F27/29

  Terminals; Tapping arrangements {for signal inductances} · CPC title

• G01P1/026 Primary

  for speed measuring devices, e.g. pulse generator · CPC title

• G01P3/488

  delivered by variable reluctance detectors · CPC title

• G01D11/245

  Housings for sensors · CPC title